uvm_fault(0xffffffff8393e450, 0xffff800026162840, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND memset() at memset+0x52 ffs_write(ffff800033918c80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c411d98,ffff800033918d18,23,fffffd8007bfb478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c411d98,ffff800033918e50,40,0,1,a1019d5910774bae,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c9e6030) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c9e6030,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c9e6030,ffff800033919080,ffff800033918fd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033919080) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033919080) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x780fb37d6d30, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff8393e450, 0xffff800026162840, 0, 2) -> d ddb> trace memset() at memset+0x52 ffs_write(ffff800033918c80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c411d98,ffff800033918d18,23,fffffd8007bfb478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c411d98,ffff800033918e50,40,0,1,a1019d5910774bae,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c9e6030) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c9e6030,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c9e6030,ffff800033919080,ffff800033918fd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033919080) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033919080) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x780fb37d6d30, count: -9 ddb> show registers rdi 0xffff800026162840 rsi 0 rbp 0xffff800033918ba0 rbx 0x840 rdx 0 rcx 0xf8 rax 0 r8 0x7c0 r9 0xffff800033918b00 r10 0xf6deaf178a419b5a r11 0xffff800026162840 r12 0x840 r13 0x1000 __ALIGN_SIZE r14 0xfffffd806c411d98 r15 0x1 rip 0xffffffff828317c2 memset+0x52 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800033918998 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor) tid=193304 pid=51828 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=16, usrpri=50, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c9e6030 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c9e7cb8,0xffff80003c9e62d8 process=0xffff80003c9ac020 user=0xffff800033914000, vmspace=0xfffffd806ba0e180 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 68609 89915 97029 0 2 0 syz-executor 81257 58194 60615 0 2 0 syz-executor 81257 337160 60615 0 3 0x4000080 kqpoll syz-executor 27373 213998 64547 0 2 0 syz-executor 27373 22294 64547 0 3 0x4000080 fsleep syz-executor 45638 393542 16414 0 2 0 syz-executor 45638 113125 16414 0 3 0x4000080 fsleep syz-executor 30691 470600 47546 0 2 0xc80 syz-executor 30691 445835 47546 0 3 0x4000080 nanoslp syz-executor 30691 154053 47546 0 3 0x4000080 fsleep syz-executor 98244 496639 25536 0 2 0 syz-executor 98244 52752 25536 0 3 0x4000080 wsevent_read syz-executor 98244 303310 25536 0 3 0x4000080 fsleep syz-executor 38903 141350 49436 0 2 0 syz-executor 38903 313992 49436 0 2 0x4000000 syz-executor 38903 73541 49436 0 3 0x4000080 fsleep syz-executor 65625 139940 0 0 3 0x14200 acct acct 47546 49457 35364 0 3 0x82 nanoslp syz-executor 64547 227563 35364 0 3 0x82 nanoslp syz-executor 59560 346773 0 0 3 0x14280 nfsidl nfsio 39695 421780 0 0 3 0x14280 nfsidl nfsio 89104 442858 0 0 3 0x14280 nfsidl nfsio 97278 119665 0 0 3 0x14280 nfsidl nfsio 49908 38882 0 0 3 0x14280 nfsidl nfsio 70576 313110 0 0 3 0x14280 nfsidl nfsio 81462 254117 0 0 3 0x14280 nfsidl nfsio 52781 226325 0 0 3 0x14280 nfsidl nfsio 10372 56472 0 0 3 0x14280 nfsidl nfsio 15102 39844 0 0 3 0x14280 nfsidl nfsio 42298 425975 0 0 3 0x14280 nfsidl nfsio 70296 342963 0 0 3 0x14280 nfsidl nfsio 94545 163932 0 0 3 0x14280 nfsidl nfsio 73462 124613 0 0 3 0x14280 nfsidl nfsio 80223 167010 0 0 3 0x14280 nfsidl nfsio 22125 106222 0 0 3 0x14280 nfsidl nfsio 99039 399559 0 0 3 0x14280 nfsidl nfsio 18537 89599 0 0 3 0x14280 nfsidl nfsio 6678 193956 0 0 3 0x14280 nfsidl nfsio 90246 90937 0 0 3 0x14280 nfsidl nfsio 81856 475150 0 0 3 0x14200 bored sosplice 36465 412968 35364 0 3 0x82 nanoslp syz-executor 60615 457200 35364 0 3 0x82 nanoslp syz-executor 16414 345884 35364 0 2 0xc82 syz-executor 25536 209917 35364 0 3 0x82 nanoslp syz-executor 49436 222264 35364 0 3 0x82 nanoslp syz-executor 97029 263540 35364 0 2 0x2 syz-executor 35364 399927 67353 0 2 0x2 syz-executor 67353 110252 74259 0 3 0x10008a sigsusp ksh 74259 36812 1424 0 3 0x98 kqread sshd-session 1424 286334 42354 0 3 0x92 kqread sshd-session 9923 276686 1 0 3 0x100083 ttyin getty 42354 443375 1 0 3 0x88 kqread sshd 84746 86743 56026 73 3 0x1100090 kqread syslogd 56026 450899 1 0 3 0x100082 sbwait syslogd 22922 166783 1 0 3 0x100080 kqread resolvd 92286 488021 73592 77 3 0x100092 kqread dhcpleased 9534 182365 73592 77 3 0x100092 kqread dhcpleased 73592 8852 1 0 3 0x80 kqread dhcpleased 24024 287493 0 0 3 0x14200 bored smr 75300 65563 0 0 2 0x14200 zerothread 18220 181662 0 0 3 0x14200 aiodoned aiodoned 74083 93051 0 0 3 0x14200 syncer update 94601 21609 0 0 3 0x14200 cleaner cleaner 33240 405454 0 0 3 0x14200 reaper reaper 77054 462426 0 0 3 0x14200 pgdaemon pagedaemon 64802 356667 0 0 3 0x14200 bored viomb 16237 395133 0 0 3 0x40014200 acpi0 acpi0 35882 178082 0 0 3 0x14200 bored softnet0 47268 467127 0 0 3 0x14200 bored systqmp 92150 376451 0 0 3 0x14200 bored systq 79562 302547 0 0 3 0x40014200 tmoslp softclock 73548 272479 0 0 3 0x40014200 idle0 1 409548 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10171 11046K 12157K 166960K 11988 0 pcb 18 16K 18K 166960K 299 0 rtable 191 9K 13K 166960K 457 0 pf 30 13K 19K 166960K 164 0 ifaddr 35 6K 8K 166960K 103 0 ifgroup 46 2K 2K 166960K 170 0 sysctl 3 1K 9K 166960K 16 0 counters 31 17K 18K 166960K 197 0 ioctlops 0 0K 4K 166960K 270 0 iov 0 0K 24K 166960K 81 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1399 88K 89K 166960K 1838 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 22 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 102K 166960K 824 0 sigio 0 0K 0K 166960K 16 0 proc 60 59K 75K 166960K 580 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 72 0 in_multi 77 5K 7K 166960K 148 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 510 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 218 150K 174K 166960K 8565 0 UVM aobj 32 2K 2K 166960K 36 0 pinsyscall 39 78K 90K 166960K 1901 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 39 0 NDP 10 0K 1K 166960K 73 0 temp 75 8648K 8724K 166960K 17530 0 kqueue 14 22K 37K 166960K 180 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 187 0 184 3 0 3 3 0 8 2 rtentry 136 145 0 75 4 0 4 4 0 8 0 unpcb 144 1002 0 982 6 0 6 6 0 8 5 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 281 0 276 7 0 7 7 0 8 6 arp 96 17 0 9 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 328 951 0 942 12 3 9 12 0 8 8 ip6q 72 7 0 3 2 1 1 1 0 8 0 ip6af 40 11 0 6 2 1 1 1 0 8 0 nd6 112 24 0 10 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 153 0 153 1 0 1 1 0 8 1 pppxif 1384 4 0 4 1 0 1 1 0 8 1 pfstscr 40 5 0 5 2 1 1 1 0 8 1 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 10 0 10 1 0 1 1 0 8 1 pfanchor 1288 3 0 1 1 0 1 1 0 8 0 pftag 88 2 0 2 1 0 1 1 0 8 1 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 11 0 9 2 1 1 1 0 8 0 pfstate 384 6 0 5 2 1 1 1 0 8 0 pfrule 1344 7 0 7 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 656 0 303 28 0 28 28 0 8 4 art_table 40 659 0 303 5 0 5 5 0 8 0 art_node 32 143 0 81 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 33 0 4 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2864 0 1365 95 0 95 95 0 8 0 ffsino 256 2864 0 1365 95 0 95 95 0 8 0 nchpl 144 4033 0 2348 63 0 63 63 0 8 0 rtmask 32 13 0 13 1 0 1 1 0 8 1 uvmvnodes 80 3183 0 0 65 0 65 65 0 8 0 vnodes 216 3183 0 0 177 0 177 177 0 8 0 namei 1024 15118 0 15118 2 1 1 1 0 8 1 pfiaddrpl 120 3 0 3 1 0 1 1 0 8 1 kstatmem 264 106 0 86 3 0 3 3 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 16346 0 16346 15 7 8 8 1 8 8 plimitpl 152 310 0 294 1 0 1 1 0 8 0 sigapl 424 1113 0 1048 9 1 8 8 0 8 0 knotepl 120 48646 0 48594 18 8 10 15 0 8 8 kqueuepl 184 362 0 349 4 0 4 4 0 8 3 pipepl 304 154 0 126 3 0 3 3 0 8 0 fdescpl 448 1076 0 1047 4 0 4 4 0 8 0 filepl 120 7684 0 7463 12 0 12 12 0 8 3 lockfpl 104 219 0 216 1 0 1 1 0 8 0 lockfspl 48 94 0 91 1 0 1 1 0 8 0 sessionpl 144 25 0 17 1 0 1 1 0 8 0 pgrppl 48 42 0 26 1 0 1 1 0 8 0 ucredpl 104 1517 0 1506 1 0 1 1 0 8 0 zombiepl 144 1049 0 1048 1 0 1 1 0 8 0 processpl 1152 1113 0 1048 5 0 5 5 0 8 0 procpl 664 2140 0 2066 7 0 7 7 0 8 0 sosppl 168 4 0 4 1 0 1 1 0 8 1 sockpl 552 2257 0 2225 15 5 10 12 0 8 7 mcl64k 65536 84 0 83 2 1 1 1 0 8 0 mcl16k 16384 7 0 7 1 0 1 1 0 8 1 mcl8k 8192 11 0 11 2 1 1 1 0 8 1 mcl4k 4096 3345 0 3292 15 7 8 15 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 1202 0 1198 2 0 2 2 0 8 1 mtagpl 96 11 0 11 2 1 1 1 0 8 1 mbufpl 256 16613 0 16487 44 25 19 43 0 8 8 bufpl 280 6438 0 210 445 0 445 445 0 8 0 anonpl 24 187900 0 184677 60 3 57 57 0 187 26 amapchunkpl 152 29638 0 29172 33 0 33 33 0 158 14 amappl16 200 3656 0 3622 20 7 13 15 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 113 0 103 1 0 1 1 0 8 0 amappl13 176 16 0 15 1 0 1 1 0 8 0 amappl12 168 1717 0 1688 2 0 2 2 0 8 0 amappl11 160 47 0 36 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 247 0 246 1 0 1 1 0 8 0 amappl8 136 20 0 19 1 0 1 1 0 8 0 amappl7 128 105 0 94 1 0 1 1 0 8 0 amappl6 120 193 0 189 1 0 1 1 0 8 0 amappl5 112 124 0 117 1 0 1 1 0 8 0 amappl4 104 269 0 253 1 0 1 1 0 8 0 amappl3 96 4901 0 4810 3 0 3 3 0 8 0 amappl2 88 1312 0 1239 2 0 2 2 0 8 0 amappl1 80 10922 0 10378 13 0 13 13 0 8 1 amappl 88 7759 0 7604 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 2 1 1 1 0 8 1 dma128 128 255 0 255 2 1 1 1 0 8 1 dma64 64 40 0 40 2 1 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 35 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1076 0 1046 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1076 0 1046 1 0 1 1 0 8 0 vmmpekpl 168 9330 0 9279 3 0 3 3 0 8 0 vmmpepl 168 72866 0 70963 98 2 96 96 0 357 12 vmsppl 368 1075 0 1046 4 1 3 4 0 8 0 rwobjpl 40 23874 0 19811 43 0 43 43 0 8 1 pdppl 4096 2159 0 2092 99 30 69 75 0 8 2 pvpl 32 481736 0 472397 133 3 130 130 0 265 35 pmappl 216 1075 0 1046 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 414 0 69 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x52 ffs_write(ffff800033918c80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c411d98,ffff800033918d18,23,fffffd8007bfb478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c411d98,ffff800033918e50,40,0,1,a1019d5910774bae,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c9e6030) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c9e6030,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c9e6030,ffff800033919080,ffff800033918fd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033919080) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033919080) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x780fb37d6d30, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x52 ffs_write(ffff800033918c80) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd806c411d98,ffff800033918d18,23,fffffd8007bfb478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c411d98,ffff800033918e50,40,0,1,a1019d5910774bae,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c9e6030) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c9e6030,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c9e6030,ffff800033919080,ffff800033918fd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033919080) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033919080) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x780fb37d6d30, count: -9